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(4p-q=18) X 3 = 12p-3q=54
(2p+3q=2)+(12p-3q=54) =14p=56
p=4
q => 2p+3q=2
2(4)+3q=28+3q=23q=-6
q=-2
5p-2q²= 5(4)-2(-2)² = 20-8=12